It would help to know more about your system setup. If you run "inxi -Fxzd" and "lsusb" from the console terminal prompt, highlight the results, copy and paste them back here, that should provide enough information.

If you go into the "Synaptic Package Manager (SPM)" and search for "iphone", you will see various packages you can install and try. Depending on how new your "iPhone" is, you may have to find an alternate method(s) for transferring files to and from your Apple iPhone or iPad, etc...

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
banshee : Depends: libgtk-sharp-beans-cil but it is not going to be installed
Depends: libgtk2.0-cil (>= 2.12.10-1ubuntu1) but it is not going to be installed
Depends: libnotify0.4-cil (>= 0.4.0~r2998) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

"Tolerance is the refuge of men without conviction."
"Common sense is not so common" - Voltaire